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摘要
The non-thermal plasma cracking technology has the advantages of wide feedstocks adaptability, quick start-up and close-down, short processing flow and non-carbon emission, which is applicable to petroleum cracking for hydrogen and acetylene. In this work, n-decane was used as the model compound of petroleum, and the characteristics of liquid spark discharge were studied in a bubble reactor. The results show that nonuniform electrode configuration, higher voltage, higher pulse frequency and faster carrier gas flow rates were in favor of discharge stability. As the plasma cracking reactions proceeded, the spark discharge took place in a bubble at first, then in microbubbles, and finally in gaseous products, of which the discharge stability and gaseous products flow rate increased in turn. The effects of treatment time and carrier gas flow rate on n-decane conversion were also investigated. The maximum of gaseous products flow rate was 124.4 mL/min(64.1%H2 and 21.0%C2H2) with the hydrogen production energy consumption of 6.1 kW?h/m3. The optical emission spectra mainly consisted of C2 and Hα, by which the gas temperature was estimated at about 3500 K and electron density was about 1.15×1017 cm-3. These results suggest that the gradual dehydrogenation process of n-decane excited by spark plasma is the main reaction pathways. This work provides a reference for improving liquid discharge stability and petroleum hydrocarbons utilization.
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